From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dan Williams <dcbw@redhat.com>
Subject: Re: [PATCH 10/17] Tools: hv: Gather ipv[4,6] gateway information
Date: Tue, 24 Jul 2012 13:36:50 -0500
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Cc: Olaf Hering <olaf@aepfle.de>,
	"K. Y. Srinivasan" <kys@microsoft.com>, gregkh@linuxfoundation.org,
	linux-kernel@vger.kernel.org, devel@linuxdriverproject.org,
	virtualization@lists.osdl.org, apw@canonical.com,
	netdev@vger.kernel.org, ben@decadent.org.uk
To: Stephen Hemminger <shemminger@vyatta.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <20120724095659.5c869511@nehalam.linuxnetplumber.net>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org

On Tue, 2012-07-24 at 09:56 -0700, Stephen Hemminger wrote:
> On Tue, 24 Jul 2012 18:53:59 +0200
> Olaf Hering <olaf@aepfle.de> wrote:
> 
> > On Tue, Jul 24, Stephen Hemminger wrote:
> > 
> > > On Tue, 24 Jul 2012 09:01:34 -0700
> > > "K. Y. Srinivasan" <kys@microsoft.com> wrote:
> > > 
> > > > +	memset(cmd, 0, sizeof(cmd));
> > > > +	strcat(cmd, "/sbin/ip -f inet  route | grep -w ");
> > > > +	strcat(cmd, if_name);
> > > > +	strcat(cmd, " | awk '/default/ {print $3 }'");
> > > 
> > > 
> > > Much simpler method:
> > > 
> > > ip route show match 0/0
> > 
> > This also has the benefit that ip is not called with absolute path, now
> > that distros move binaries around.
> > 
> > Olaf
> 
> It is also not hard to do the same thing with a little function
> using libmnl

Yeah seriously, netlink anyone?  You'll even get nicer error reporting
that way.

Dan